What are dimensions ? Give an ex...

What are dimensions ? Give an example.

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Dimensions are the powers to which the fundamental units or quantities are raised to represent a given physical quantity.
e.g., : Dimensions of length, mass and time in the formula for gravitational constant ` ( M^ ( -1) L ^ ( 3)T^( -2) ) ` are 3, -1 and -2 respectively.

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